// SPDX-License-Identifier: GPL-2.0
|
#include <asm/paravirt.h>
|
#include <asm/asm-offsets.h>
|
#include <linux/stringify.h>
|
|
DEF_NATIVE(pv_irq_ops, irq_disable, "cli");
|
DEF_NATIVE(pv_irq_ops, irq_enable, "sti");
|
DEF_NATIVE(pv_irq_ops, restore_fl, "pushq %rdi; popfq");
|
DEF_NATIVE(pv_irq_ops, save_fl, "pushfq; popq %rax");
|
DEF_NATIVE(pv_mmu_ops, read_cr2, "movq %cr2, %rax");
|
DEF_NATIVE(pv_mmu_ops, read_cr3, "movq %cr3, %rax");
|
DEF_NATIVE(pv_mmu_ops, write_cr3, "movq %rdi, %cr3");
|
DEF_NATIVE(pv_cpu_ops, wbinvd, "wbinvd");
|
|
DEF_NATIVE(pv_cpu_ops, usergs_sysret64, "swapgs; sysretq");
|
DEF_NATIVE(pv_cpu_ops, swapgs, "swapgs");
|
|
DEF_NATIVE(, mov32, "mov %edi, %eax");
|
DEF_NATIVE(, mov64, "mov %rdi, %rax");
|
|
#if defined(CONFIG_PARAVIRT_SPINLOCKS)
|
DEF_NATIVE(pv_lock_ops, queued_spin_unlock, "movb $0, (%rdi)");
|
DEF_NATIVE(pv_lock_ops, vcpu_is_preempted, "xor %eax, %eax");
|
#endif
|
|
unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len)
|
{
|
return paravirt_patch_insns(insnbuf, len,
|
start__mov32, end__mov32);
|
}
|
|
unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len)
|
{
|
return paravirt_patch_insns(insnbuf, len,
|
start__mov64, end__mov64);
|
}
|
|
extern bool pv_is_native_spin_unlock(void);
|
extern bool pv_is_native_vcpu_is_preempted(void);
|
|
unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
|
unsigned long addr, unsigned len)
|
{
|
const unsigned char *start, *end;
|
unsigned ret;
|
|
#define PATCH_SITE(ops, x) \
|
case PARAVIRT_PATCH(ops.x): \
|
start = start_##ops##_##x; \
|
end = end_##ops##_##x; \
|
goto patch_site
|
switch(type) {
|
PATCH_SITE(pv_irq_ops, restore_fl);
|
PATCH_SITE(pv_irq_ops, save_fl);
|
PATCH_SITE(pv_irq_ops, irq_enable);
|
PATCH_SITE(pv_irq_ops, irq_disable);
|
PATCH_SITE(pv_cpu_ops, usergs_sysret64);
|
PATCH_SITE(pv_cpu_ops, swapgs);
|
PATCH_SITE(pv_mmu_ops, read_cr2);
|
PATCH_SITE(pv_mmu_ops, read_cr3);
|
PATCH_SITE(pv_mmu_ops, write_cr3);
|
PATCH_SITE(pv_cpu_ops, wbinvd);
|
#if defined(CONFIG_PARAVIRT_SPINLOCKS)
|
case PARAVIRT_PATCH(pv_lock_ops.queued_spin_unlock):
|
if (pv_is_native_spin_unlock()) {
|
start = start_pv_lock_ops_queued_spin_unlock;
|
end = end_pv_lock_ops_queued_spin_unlock;
|
goto patch_site;
|
}
|
goto patch_default;
|
|
case PARAVIRT_PATCH(pv_lock_ops.vcpu_is_preempted):
|
if (pv_is_native_vcpu_is_preempted()) {
|
start = start_pv_lock_ops_vcpu_is_preempted;
|
end = end_pv_lock_ops_vcpu_is_preempted;
|
goto patch_site;
|
}
|
goto patch_default;
|
#endif
|
|
default:
|
patch_default: __maybe_unused
|
ret = paravirt_patch_default(type, clobbers, ibuf, addr, len);
|
break;
|
|
patch_site:
|
ret = paravirt_patch_insns(ibuf, len, start, end);
|
break;
|
}
|
#undef PATCH_SITE
|
return ret;
|
}
|
